Corrosion Behaviour of Q235B Carbon Steel in Sediment Water From Crude Oil

doi:10.11902/1005.4537.2016.212

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (2): 126-134 DOI: 10.11902/1005.4537.2016.212

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Corrosion Behaviour of Q235B Carbon Steel in Sediment Water From Crude Oil

Qingli CHENG^1,²(

),Bin TAO¹,Shuan LIU³(

),Quanzhen LIU¹,Weihua ZHANG¹,Songbai TIAN²,Liping WANG³

1 SINOPEC Qingdao Research Institute of Safety Engineering, Qingdao 266071, China
2 SINOPEC Research Institute of Petroleum Processing, Beijing 100083, China
3 Institute of Materials Technology, Ningbo Institute of Industrial Technology, Chinese Academy of Sciences, Ningbo 315201, China

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Abstract

With the increasing import of high-sulfur oils, the storage tank bottom plates suffer severe corrosion from sediment water, which often cause the leakage of crude oil and result in serious economic loss and environmental pollution. The corrosion behavior of Q235B carbon steel in sediment water from crude oil was investigated by means of electrochemical impedance spectroscopy, wire beam electrode, electrochemical measurements and SEM/XRD techniques. Results showed that during the initial immersion period of 21 d the carbon steel suffered from uniform corrosion and its corrosion rate decreased with time. Afterwards, the corrosion was transformed to localized corrosion and its corrosion rate increased with time during the period of 21~35 d of immersion. The fact can be explained that the carbon steel surface was covered by scale of CaCO₃, and the corrosion process can be hindered. However, corrosion pits were initiated and accelerated with increasing of time due to loss of corrosion protection from CaCO₃ deposits after 21 d.

Key words: sediment water of curde oil Q235B carbon steel corrosion wire beam electrode

Received: 27 October 2016

Fund: Supported by SINOPEC Qingdao Research Institute of Safety Engineering (Y-199 and Y-200), National Natural Science Foundation of China (41506098), China Postdoctoral Fund and the Ninth Batch Special Funding(2015M580528 and 2016T90553) and Ningbo Natural Science Fund (2016A610261)

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	Qingli CHENG
	Bin TAO
	Shuan LIU
	Quanzhen LIU
	Weihua ZHANG
	Songbai TIAN
	Liping WANG

Cite this article:

Qingli CHENG,Bin TAO,Shuan LIU,Quanzhen LIU,Weihua ZHANG,Songbai TIAN,Liping WANG. Corrosion Behaviour of Q235B Carbon Steel in Sediment Water From Crude Oil. Journal of Chinese Society for Corrosion and protection, 2017, 37(2): 126-134.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.212 OR https://www.jcscp.org/EN/Y2017/V37/I2/126

Fig.1 10×10 matrix shaped wire beam electrode (WBE) (a) and schematic diagram of the three-electrode system (b) used in simulated sediment water from crude oil tank

Fig.2 SEM images of Q235B carbon steel after immersion in sediment water for 7 d (a) and 35 d (b)

Fig.3 SEM images of Q235B steel after immersion in sediment water for 1 d (a) and 35 d (b) without corrosion product

Fig.4 Time dependence of mass loss of Q235B carbon steel after immersion in sediment water for 35 d

Fig.5 SEM image (a) and EDS analysis (b) of Q235B carbon steel after immersion in sediment water for 35 d

Fig.6 XRD spectrum of the precipitates on Q235B carbon steel surface after immersion in sediment water for 35 d

Fig.7 Nyquist (a) and Bode (b) plots of Q235B carbon steel after immersion in sediment water for different time

Fig.8 Equivalent circuits used to fit the EIS data of the Q235B carbon steel after immersion in sediment water for different time

Fig.9 Time dependence of 1/R_ct of Q235B carbon steel after immersion in sediment water for different time

Fig.10 Evolution of distribution of potential (a1~g1) and galvanic current (a2~g2) for Q235B carbon steel after immersion in deoxygenated sediment water for 1 d (a1, a2), 3 d (b1, b2), 7 d (c1, c2), 14 d (d1, d2), 21 d (e1, e2), 28 d (f1, f2) and 35 d (g1, g2)

Fig.11 LF values of Q235B carbon steel WBE as a function of immersion time

Fig.12 Corrosion mechanism of Q235B carbon steel in sediment water during 35 d of immersion

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